Verify if a citation string is in a valid format using citeurl's advanced parsing. This tool performs validation using citeurl's comprehensive citation templates to check if a citation appears to be in a recognized legal citation format. This is much more accurate than simple regex matching. Retu...
Part of the CourtListener server.
Free to start. No card required.
AI agents call citation_verify_citation_format to retrieve information from CourtListener without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though citation_verify_citation_format only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"citation_verify_citation_format": {}
}
}See the full CourtListener policy for all 19 tools.
These attack patterns abuse exactly the kind of access citation_verify_citation_format gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Verify if a citation string is in a valid format using citeurl's advanced parsing. This tool performs validation using citeurl's comprehensive citation templates to check if a citation appears to be in a recognized legal citation format. This is much more accurate than simple regex matching. Returns information about the citation format and any detected issues. Args: citation: The citation string to verify. ctx: The FastMCP context for logging. Returns: dict[str, str | bool | list[str] | None]: A dictionary containing validation results with: - valid: Whether the citation is in a valid format - format: The recognized citation format type (if valid) - template: The citation template matched (if valid) - issues: List of any validation issues found - citation: The original citation string. It is categorised as a Read tool in the CourtListener MCP Server, which means it retrieves data without modifying state.
Register the CourtListener MCP server in PolicyLayer and add a rule for citation_verify_citation_format: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches CourtListener. Nothing to install.
citation_verify_citation_format is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the citation_verify_citation_format rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for citation_verify_citation_format. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
citation_verify_citation_format is provided by the CourtListener MCP server (https://courtlistener-mcp.vaquill.ai/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 CourtListener tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.